Pete Oxford / Yellow-tailed Surgeonfish (Prionurus laticlavius) school and snorkeler, Galapagos Islands, Ecuador

Pete Oxford / Yellow-tailed Surgeonfish (Prionurus laticlavius) school and snorkelers, Galapagos Islands, Ecuador

Pete Oxford / Yellow-tailed sawfish / surgeonfish (Prionurus laticlavius) shoal off Wolf Island, Galapagos Islands

Pascal Kobeh / Close-up of the head of a Yellowfin surgeonfish (Acanthurus xanthopterus) Maldives, Indian Ocean.

Juergen Freund / Yellowfin surgeonfish (Acanthurus xanthopterus), Great Barrier Reef, Queensland, Australia.

Claudio Contreras / Yellowfin surgeonfish (Acanthurus xanthopterus) with Leopard grouper (Mycteroperca rosacea) in the background, Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

Fred Bavendam / Yellow-tailed Surgeonfish (Prionurus laticlavius) school, Ecuador

Pete Oxford / Yellow-tailed Surgeonfish (Prionurus laticlavius) school, Wolf Island, Galapagos Islands, Ecuador

Pete Oxford / King Angelfish (Holacanthus passer) and Yellowtail Surgeonfish (Prionurus laticlavius) mixed school over reef, Gardner Bay, Espanola Island, Galapagos Islands, Ecuador

David Fleetham / Yellowfin surgeonfish (Acanthurus xanthopterus) female at a cleaning station with endemic Hawaiian cleaner wrasse (Labroides phthirophagus) Hawaii.